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Merck Manual
Veterinary Manual
The trusted provider of veterinary information since 1955
VETERINARY PET
Calculating an Odds Ratio

Calculating an Odds Ratio

Outcome Status

+

−

Exposure Status

+

a

b

−

c

d

a = Number of exposed cases

b = Number of exposed non-cases

c = Number of unexposed cases

d = Number of unexposed non-cases

Merck and the Merck Veterinary Manual

Merck & Co., Inc., Rahway, NJ, USA is a global healthcare leader working to help the world be well. From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world.  The Merck Veterinary Manual was first published in 1955 as a service to the community.  The legacy of this great resource continues as the Merck Veterinary Manual in the US and Canada and the MSD Manual outside of North America.

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